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G. W. WALLIN. PNEUMATIC MOTOR. APPLICATION FILED JUNE 5. l915- PatentedJune 10, 1919.

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=NITED earns PATENT or GUSTAV W. WALLIN, OF CHICAGO, ILLINOIS, ASSIGNORT0 GULBRANSEN-DICKINSO'N COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OFILLINOIS.

PNEUMATIC MOTOR.

Specification of Letters Patent.

Patented June 10, 1919.

Application filed June 5, 1915. Serial No. 32,252.

To all whom it may concern:

Be it known that I, GUs'rAv W. WALL1N,'a subject of the King of Sweden,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Pneumatic Motors, ofwhich the following is a full, clear, concise, and exact description,reference being had to the accompanying drawings, forming a part of thisspecification.

My invention relates to pneumatic motors such as are employed upon pianoplayers or player pianos for operating the musicrolls to draw theperforated music-sheet across the tracker-board.

It will be obvious that my device is useful as a motive device wherevera fluid is used as an operating medium, and it will therefore beunderstood that I citethe above use merely as an instance of theemployment of my invention.

My invention is concerned particularly with the valve mechanism for sucha motor, and the object of my improvement is to provide valve mechanismwhich will operate accurately and definitely, which will be simple inconstruction and arrangement, economical to manufacture, and eflicientin its operation. By efiiciency in operation I mean particularly theabsence of leaks, the absence of undue friction, and the ability toeffect the valve changes with the proper degree of suddenness' andcompleteness to secure the greatest power from the motor. The motiveunits which I employ are illustrated in the drawings as being bellows orneumatics, but it will be understood that cylinders and pistons may beequally Well employed without varying from the cooperation with thevalve mechanism. Just as 7 cylinders and pistons provide expansiblecompartments, so do bellows or pneumatics,

that my invention is concerned, and these features will be more readilyunderstood by reference to the accompanying drawings, in which Figure 1is a front elevational view ofthe device of my invention;

Fig. 2 is a rear elevational view thereof,

drawn on a slightly smaller scale and in cluding exemplary mechanism forconnectmg the motor to the driven shafts;

F1g. 3 is a plan view of the device of my invention;

,Fig. 4 is a cross-sectional view taken on the plane ofthe line H ofFig. 3 and lookmg in the direction indicated by the arrows;

Fig. 5 is a crosssectional view through the enil-board, which containsthe vertical channe s; 7

Fig. 6 is a sectional view taken on the plane of the line 6-6 of Fig. 5and looking in the direction indicated by the arrows, the line 55 ofFig. 6 indicating the plane of section of Fig. 5;

Figs. 7 and 8 are inner face views of the end-board, showing thevalve-member in different positions;

Fig. 9 is an outer face view of the endboard, showing the valve-memberthereon;

Fig. 10 is a face view of one ofthe valvemembers employed, bothvalve-members being of the same construction ;"and,

Fig. 11 is the opposite face view of the valve-member employed.

It will be seen that'the general framework of the motor of my inventioncomprises a vertical supporting-board 12, and end-standard 13, anend-board 14 at the other end,

and a top-board 15. These pieces are all iai 'd l scribed, can beoperatively connected with a shaft orshafts to be drlven, This general,

framework supports. all the mechanism, and contains the air passages, aswill be described. I

Secured to the back of the top-board 15 and -theverticalnboardz 12- 1s aboard .16,

slightly inclined from vertical, as illustrated in Fig. 4. A board 17,also slightly nclined from vertical but in the opp osite dlIQQtlQll,sdiiie ldieiu sifi the" a d e ei shapedcenter-piece,'18 being clampedbetween them. ITh'eQcenter-piece '18 is made of two' parts; and betweenth'ese two parts, n central ;positio'n,i a {hinged inenliber 19 1sdisposed,"the'pa rtsll5; 1'7,1'8'and 1 9, all b'eing g firmlyghfeldlagainst the back of the topboard 15 means fof sgcfife'jws 2( )--2 0.

K mov lesome 1. ngs lQ h hingedjnien bei' l9; as illustratedin Fig. 4,

rdslfi Midi W lifi mQVabl bo d .215. thus formi'n 2 5 Y V It will 'nowbe understood, that all the parts indicated by the reference characters16 to ,23 incl,u,s ive, combine to form an op- V era'tive unit, of which.there are three, 'as indicated in Figs L' zand at a, b and 0.

Thus, there. are bellows f compartments.

. formedby a' hol'e in'tlie boaiid 1 7 m" closed y nW nt-e rght. t ip2,97 Leading downwardly-in the, end-board let fro'm'the horizontal channelsin the top;

h ar .a i-c iere ext nded. j nto he. n

bflardile efthe ch x nels 0 3 035 3 330 as siespee ayai p nelower' enterh hann onep Side ilfli were 1 es e m-1 pro: vide ;1 and 1 eachwalvers'eat 15 :provided 1 with three openihgs',s2 32 32 32 se and 32 s;the ea e m y be. mm iqs insi re pe ely, wi h hgveni alpassageway. h aprture 13-231 etei riev heyv l s, Pr ccal y, an t ey e spac d {equi snfly om an ax -Mend 0-. rees apa Mount d upon the Q-IX'ISAA 1 th n r l pit gnfi e i m 1. an in he tandin hor zontal po tion, is he ram;- shaft34L, which; as clearly: ShQWlfi in Figs. 1

1and2, is providedwith the three cranks have been describe d, asfcl two,f bellowsi compartments 3535' in respective vertical register withtherbellowsunitsa, b andc. The movable member 2liofe ch. ofthehellQunits is provided'with a downward extension '36, to whichfa connectingmember 37 1s pivoted at 38,th1s connecting member belng mounted inthebifurcated end of theez ztensiqn The other end of the connectingmember embraces the crank-35, as indicated at 39. The cranksare disposed120 degreesapart in po-' sition, and the successive impulses which arensm tted o the shaft rbyl hecp lt iolii the bellows units will become:appa nt-"as; this description 1 proceeds? thin theL Q r and surrbundng. 1e crankshaft 34 is a chamber-1L0; whi'cl is p rt t o ed o h o her;chann ls whi h a arly;i l ustratedli i' Figs- 5. and 'b 1tivh h,-,1,thlo ierghand;

A bef r d cated; thei valrei inr r s illustrated in Figs. 1 ()"an di11.ljapplythe reference character 42 to Q the valve-member an t i ppe r P eent y hat h re are two ofjthese members, simil my constructed, 1 v lve-mm e x a i rpv o i' ed With L en arc-shaped"openingspanning an an'gle ofa '7 little more than 1QO CigI 'QQ;Sf, fl1lS: opening being illustratedat 43. It will now be b i hat he valvem mb' 2 i j n the form of a diska'd'a'pjte'djto engage the valve-seats V The 5 va1v'e'- n1e1 nb er proed wi hi pdsketis t -eh i lewh' 'cil engages the valve seats, thispocket beingjn' the 'iorn f a are supplemented by a en; tralport ionwhich, as illustrated, is adapted to coincide with theichambjerO in theboard 141Kw T he] a e po on. of thewpoc et 4, l ke 7 he j penin 3,1 uc zs t span a little morethall 20 degrees Furthermore,

thepocket 44L and I the openingita are of fsiich a radius that theymayregisterias illustrated in thedrawings, with one; or more ofthfeopenings 32% 32 etc.l Thegiactlthat only r e openi g a e, provided- 11achil e t makes P sible, to i a thes :QPQI i very close to thecentei Ivalvejdisk is small and friction reduced to a nim m; The. fa t hat t tvilv iniel ha-j pe ial impbxr an e inceii ti bal er atlie structure,distributes thei'friction, maE ;0

ti inw fifi v v 'iinl tsg i. 7 P o max m m? u ace dstw d l l ts andv' utiet j Wit m n m m fisp ir ge ainst eaks- The valve disks, 42%421, arecapable: of;

m li r e apermitshof mplerdistrij bl gitudinfi lI QYementjon the'jshaift3 i, and, V V

s trate in F gsand/ 2; a ps-fir Y ti elyi n ec d h. .theasliafta f0 larmovement by meansfof'the dogs aid- 45, I30 5 this mrist e .pre a r a 7which are secured to the crank-shaft 34 by means of set-screws 46-46,and which engage in notches 47-47 (Figs. 7 and 10) in the periphery ofthe disks. Coiled springs of light tension are disposed between the dogs4545 and the valve disks 42-42, being illustrated at 4848, to maintainthe valve disks upon their respective seats.

As illustrated in Fig. 2, the crank-shaft 34, beyond the standard 13, isprovided with a sprocket-wheel 49, which, by means of a sprocket-chain50, operates the sprocket 51 on one driven shaft 52. By means of ashifting arrangement 53, operated by a lever 54 and a link 55, the shaft34 upon which the shifting means is splined, may be disconnected fromthe sprocket 49 at 56 and connected with another driven shaft 57 throughthe intervention of the pinion 58 and the gear 59.

The operation will now be clear. When suction is applied at thepassageway 41 this suction is transmitted through the chamber 40, thepocket 44 and the valve-seat openings which happen to be incommunication with the pocket 44 at that time. The arrangement is suchthat, as the valve-members turn, one valve-seat opening is being openedinto the pocket 44, while the next one is being closed off. This will beevident from Fig. 9. Once in communication with the pocket 44 thevalve-seat opening remains in such communication while the valve passesthrough approximately 120 degrees of its revolutlon, and, while thatvalve opening is then closed, the next one is opened.

The same general description app-lies with reference to the opening 43,except that the exposed valve-seat opening is opened to the atmosphereinstead of being connected with suction. The result is that the bellowschambers are successively connected with the suction, remaining in suchconnection for approximately 120 degrees of the rotation of thecrank-shaft, these connections over-lapping somewhat, so tliat as onebellows chamber is gradually cut out the next one is gradually cut in. Ispeak of this operation as taking place gradually, since, o bvlously,the operation is not instantaneous, but it is sufliciently sudden andeifective to get the proper power. At the same time it is suflicientlygradual so that as one bellows chamber is being relieved of the burdenof moving the shaft, the next one is taking on the burdencorrespondingly. It will also be clear that, precisely as each bellowschamber is connected with suction, just so is the opposite bellowschamber connected with the atmosphere, so that, for instance, while theboard 21 is moving to the left in response to suction, the air may comein at the right of the board to provide the required pressure. By thesesuccessive impulses, as has been described, the shaft 34 is moved withan even torque.

I claim as new and desire to secure by Letters Patent of the UnitedStates the followmg:

In a motor, a plurality of double bellows, each pair having a commonmovable member, a channel-board, a plurality of channels therein, thosefor one side of said bellows being in one side of said board and thosefor the other side of said bellows being in the other side of saidboard, a second channel-board at right angles to said first namedchannel board and having similarly arranged channels forming extensionsrespectively from said first named channels, a crank-shaft mounted insaid second board, said second-named channels on one side opening into avalve-seat on their side of the board circularly about said shaft, andthe second-named channels on the other side opening on their side of theboard circularly about said shaft, and a valve-member mount ed on saidshaft over each set of openings.

In witness whereof, I hereunto subscribe my name this 2nd day of June,A. D. 1915.

GUSTAV W. WALLIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

